That brings up another subject that Matt Cutts did not answer in his blog but it is a possibility. Does a search engine skip over some or all invalid code so it is not indexed? My search engine spider did but I do not think that is proof because other times it will index things. Will google's spider skip over id="row" when it shows up more than once? If you use class="row" then it will read it correctly. I don't think there is a way to find that question out other than a wild guess. LOL now you have me thinking and I am not use to doing that.
Don
Seopro